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  • What does if set means here? Is it mean if the path exist Commented Jan 17, 2018 at 13:15
  • if set means if you set the variable. Commented Jan 17, 2018 at 13:18
  • @TheComputerGeek010101001 can you give an example on how/when to use this specific notation? what is the difference to using ${variable} or $variable Commented Jan 17, 2018 at 13:20
  • I use this command to execute home folder by typing " $[/home/souro]" but it shows error "bash: /home/souro: syntax error: operand expected (error token is "/home/souro")" Commented Jan 17, 2018 at 13:20
  • You want: home=/home/souro Then to reference your home folder, just use $home. Commented Jan 17, 2018 at 13:26